package com.ng.finance.common.util;

import com.ng.finance.api.entity.WechatUser;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.util.Date;

/**
 * jwt工具类
 */
public class JwtUtils {

    public static final String SUBJECT = "ng_fomamce";

    public static final long EXPIRE = 1000 * 60 * 60 * 24 * 7;  //过期时间，毫秒，一周

    //秘钥
    public static final String APPSECRET = "xd666";

    /**
     * 生成jwt
     *
     * @param user
     * @return
     */
    public static String geneJsonWebToken(WechatUser user) {

        if (user == null || user.getId() == null || user.getUserName() == null
                || user.getUnionid() == null) {
            return null;
        }
        String token = Jwts.builder().setSubject(SUBJECT)
                .claim("id", user.getId())
                .claim("userName", user.getUserName())
                .claim("getUnionid", user.getUnionid())
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))
                .signWith(SignatureAlgorithm.HS256, APPSECRET).compact();

        return token;
    }


    /**
     * 校验token
     *
     * @param token
     * @return
     */
    public static Claims checkJWT(String token) {
        try {
            final Claims claims = Jwts.parser().setSigningKey(APPSECRET).
                    parseClaimsJws(token).getBody();
            return claims;

        } catch (Exception e) {
        }
        return null;

    }
}
